Not sure if these errors are due to some bug or due to some sort of distributed attack? Malicious activity? Such errors seem to be thrown every couple of seconds.

[Sun Jan 05 04:33:11.510310 2025] [php:notice] [pid 1456953] [client 172.71.194.153:23004] Default exception handler: Can't find data record in database. Debug: \n                    SELECT c.\n                      FROM {course_modules} cm\n                      JOIN {course} c ON c.id = cm.course\n                     WHERE cm.id = ?\n[array (\n  0 => 1071,\n)]\nError code: invalidrecordunknown\n line 1690 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown\n* line 2868 of /lib/modinfolib.php: call to moodle_database->get_record_sql()\n* line 30 of /mod/assign/view.php: call to get_course_and_cm_from_cmid()\n
[Sun Jan 05 04:33:13.754121 2025] [php:notice] [pid 1456472] [client 162.158.79.15:26460] Default exception handler: Can't find data record in database. Debug: \n                    SELECT c.\n                      FROM {course_modules} cm\n                      JOIN {course} c ON c.id = cm.course\n                     WHERE cm.id = ?\n[array (\n  0 => 1071,\n)]\nError code: invalidrecordunknown\n line 1690 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown\n* line 2868 of /lib/modinfolib.php: call to moodle_database->get_record_sql()\n* line 30 of /mod/assign/view.php: call to get_course_and_cm_from_cmid()\n
[Sun Jan 05 04:33:28.894811 2025] [php:notice] [pid 1456206] [client 172.70.175.107:33186] Default exception handler: Can't find data record in database. Debug: \n                    SELECT c.\n                      FROM {course_modules} cm\n                      JOIN {course} c ON c.id = cm.course\n                     WHERE cm.id = ?\n[array (\n  0 => 1071,\n)]\nError code: invalidrecordunknown\n line 1690 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown\n* line 2868 of /lib/modinfolib.php: call to moodle_database->get_record_sql()\n* line 30 of /mod/assign/view.php: call to get_course_and_cm_from_cmid()\n
[Sun Jan 05 04:33:36.102967 2025] [php:notice] [pid 1456953] [client 172.70.134.214:59960] Default exception handler: Can't find data record in database. Debug: \n                    SELECT c.\n                      FROM {course_modules} cm\n                      JOIN {course} c ON c.id = cm.course\n                     WHERE cm.id = ?\n[array (\n  0 => 1071,\n)]\nError code: invalidrecordunknown\n line 1690 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown\n* line 2868 of /lib/modinfolib.php: call to moodle_database->get_record_sql()\n* line 30 of /mod/assign/view.php: call to get_course_and_cm_from_cmid()\n
[Sun Jan 05 04:33:41.590302 2025] [php:notice] [pid 1456721] [client 172.71.195.49:42736] Default exception handler: Can't find data record in database. Debug: \n                    SELECT c.\n                      FROM {course_modules} cm\n                      JOIN {course} c ON c.id = cm.course\n                     WHERE cm.id = ?\n[array (\n  0 => 1071,\n)]\nError code: invalidrecordunknown\n line 1690 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown\n* line 2868 of /lib/modinfolib.php: call to moodle_database->get_record_sql()\n* line 30 of /mod/assign/view.php: call to get_course_and_cm_from_cmid()\n
[Sun Jan 05 04:34:09.850238 2025] [php:notice] [pid 1456206] [client 172.71.194.220:32774] Default exception handler: Can't find data record in database. Debug: \n                    SELECT c.\n                      FROM {course_modules} cm\n                      JOIN {course} c ON c.id = cm.course\n                     WHERE cm.id = ?\n[array (\n  0 => 1071,\n)]\nError code: invalidrecordunknown\n line 1690 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown\n* line 2868 of /lib/modinfolib.php: call to moodle_database->get_record_sql()\n* line 30 of /mod/assign/view.php: call to get_course_and_cm_from_cmid()\n
[Sun Jan 05 04:34:30.498626 2025] [php:notice] [pid 1457105] [client 172.71.223.120:57562] Default exception handler: Can't find data record in database. Debug: \n                    SELECT c.\n                      FROM {course_modules} cm\n                      JOIN {course} c ON c.id = cm.course\n                     WHERE cm.id = ?\n[array (\n  0 => 1071,\n)]\nError code: invalidrecordunknown\n line 1690 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown\n* line 2868 of /lib/modinfolib.php: call to moodle_database->get_record_sql()\n* line 30 of /mod/assign/view.php: call to get_course_and_cm_from_cmid()\n
[Sun Jan 05 04:34:41.041291 2025] [php:notice] [pid 1456331] [client 172.71.223.100:47094] Default exception handler: Can't find data record in database. Debug: \n                    SELECT c.\n                      FROM {course_modules} cm\n                      JOIN {course} c ON c.id = cm.course\n                     WHERE cm.id = ?\n[array (\n  0 => 1071,\n)]\nError code: invalidrecordunknown\n line 1690 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown\n* line 2868 of /lib/modinfolib.php: call to moodle_database->get_record_sql()\n* line 30 of /mod/assign/view.php: call to get_course_and_cm_from_cmid()\n
[Sun Jan 05 04:34:43.968817 2025] [php:notice] [pid 1456472] [client 172.71.194.112:47262] Default exception handler: Can't find data record in database. Debug: \n                    SELECT c.\n                      FROM {course_modules} cm\n                      JOIN {course} c ON c.id = cm.course\n                     WHERE cm.id = ?\n[array (\n  0 => 1071,\n)]\nError code: invalidrecordunknown\n line 1690 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown\n* line 2868 of /lib/modinfolib.php: call to moodle_database->get_record_sql()\n* line 30 of /mod/assign/view.php: call to get_course_and_cm_from_cmid()\n
[Sun Jan 05 04:35:03.619967 2025] [php:notice] [pid 1456721] [client 172.68.245.148:18176] Default exception handler: Can't find data record in database. Debug: \n                    SELECT c.\n                      FROM {course_modules} cm\n                      JOIN {course} c ON c.id = cm.course\n                     WHERE cm.id = ?\n[array (\n  0 => 1071,\n)]\nError code: invalidrecordunknown\n line 1690 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown\n* line 2868 of /lib/modinfolib.php: call to moodle_database->get_record_sql()\n* line 30 of /mod/assign/view.php: call to get_course_and_cm_from_cmid()\n